Question

Use the following information to answer the next four questions. Endocrine Disruptors in the Environment Rainbow Darter Fish. R. Hays Cummins - Miami University Scientists have noticed a disturbing trend in the freshwater ecosystems in North America: a large number of male fish are found to contain female egg cells growing inside their testes. The feminization of male fish is called intersex, and its exact cause is still baffling many scientists. Many studies have shown that intersex can be induced when male fish are exposed to endocrine disruptors. However, it is easier to demonstrate the direct cause and effect in a laboratory environment where the fish are only exposed to a single endocrine disruptor. In nature, there are many other variables such as low oxygen levels or warmer water temperatures that could also cause feminization in fish.

Answer 1

Ans) Feminization of eggs is a major concern as

1)It impairs the quality of sperms produced by male fishes thus impairing fitness of progeny

2)It causes sex ratio imbalance in fish population which hampers fish reproduction and proliferation of species.

Ans) Endocrine disruptions are mainly due to anthropogenic chemical pollution.

So it can be reduced by following measures-

Proper disposal of agricultural waste and preventing their surface runoff.

Correct treatment of waste from industries before they are discharged in water bodies.

Prevention of hot water discharge from nuclear plants.

Proper treatment of water bodies from time to time.